With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpMaxVlanStorage
vtp Max Vlan Storage
1.3.6.1.4.1.9.9.46.1.1.2
An estimate of the maximum number of VLANs about which the local system can recover complete VTP information after a reboot. If the number of defined VLANs is greater than this value, then the system can not act as a VTP Server. For a device which has no means to calculate the estimated number, this value is -1.
Back to CISCO-VTP-MIB MIB page.
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